"M.E.P.S. Only Jehovah could put his idea for M.E.P.S into a human mind. Just like the Tabernacle builders of old who received the Holy Spirit to invent never before seen "socket pedastles", the humble brothers were able to design M.E.P.S. No other organization on earth could have done this. This is 100% proof that JWs have the truth and are being used exclusively by Jehovah."
From the sounds of it, this is what was being said at the meeting DD attended.
The Insight book provides further detail regarding the building of the Tabernacle and states
"Design Jehovah had spoken to Moses in the mountain, giving him the complete pattern for the tabernacle, commanding him: “See that you make all things after their pattern that was shown to you in the mountain.” It served in providing “a shadow of the heavenly things” and therefore had to be accurate to the least detail. (Heb 8:5) Jehovah inspired Bezalel and Oholiab, so that the work, which others including both men and women shared in, could be done perfectly, according to the instructions Moses gave. The result was: “According to all that Jehovah had commanded Moses, that was the way the sons of Israel did all the service.”
http://wol.jw.org/en/wol/d/r1/lp-e/1200004295
To be noted from the article is that God spoke directly to Moses explaining the pattern required and Bezalel and Oholiab were inspired to carry out the work, so that it could be done perfectly.
This would suggest that the JWs claim that God spoke directly to that MEPS designer who then instructed some chief workers to follow out those instruction with the help of inspiration from the holy spirit.
If this is really so, it is no wonder DD wants to go back.
The only flaw to this is that the tabernacle was perfect, the MEPS system isn't, so I'm sure DD will be returning.
I couldn't find anything to confirm that the tabernacle builders were the first to invent these socket pedestales, even so, if they had been then it was from God's direct instruction and inspiration.